傅里叶变换实时红外光谱复原的FPGA实现

Implement of Fourier transform in real-time infrared spectrum recovery based on FPGA

为实时获取战场激光、大气污染物气体、毒气等待测物光谱信息的光谱复原,设计了基于现场可编程门阵列(FPGA)的实时光谱采集分析系统。该系统选用迈克尔逊干涉具和碲镉汞探测器获取待测光谱信息,将采集到的数据传入FPGA。利用硬件描述语言VerilogHDL在Xilinx FPGA芯片上依据傅里叶变换(FFT)实现干涉条纹到光谱数据的实时处理。实验结果表明,FPGA实际计算1 024点基2-FFT频谱分布信息与Matlab理论计算结果相同,可满足实时光谱探测的要求。

In order to obtain the real-time spectrum recovery of spectrum information such as battlefield laser, atmospheric pollutants gases, poisonous gas, etc. the real-time spectrum ac- quisition and analysis system based on FPGA was designed. The spectral information was abtained by using a Michelson interferometer and HgCdTe detector, and the collected date was transmitted to FPGA. Using hardware language Verilog HDL on the chip of Xilinx FPGA, the system achieved real-time processing of the spectrum data from interference pattern based on FFT. The simulation result indicates that the spectrum distribution information calculated by 1 024-point radix 2-FFT with FPGA is the same as the theoretical calculation result of Matlab, which can meet the requirement for real-time spectral detection.